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As has been said its at your own risk, as gargoyle said being in the middle of the stud and pre-drilling are important for any weight loading on regular studs. Honestly I'd say put an extra stud there so that you can use a washer on the back to spread out the pressure vs having it concentrated.

I was thinking about getting rid of my bed, replacing it with a hammock full-time. It would create alot more room for me, room that cannot accommodate a 12'L hammock stand.

Is it safe for an eye bolt to be put into the wall stud? Would it take 160lbs?
Has anyone tried this, successfully, before?
Please get back to me.

My 14' steel hammock stand disassembles in a couple of minutes and takes up about as much space as a mop and a mop bucket in a closet. Using a stand also affords one the option of setting up in different locations whereas an eye bolt is fixed.

And remember, the load on the studs is not restricted to your weight. It's geometrical.
-Basic trig - force on the support is the hypoteneus of a triangle.

h = (.5 x user weight) / sin(support angle)

In other words, a 200 pound occupant will exert 200 pounds of force per side with a 30 degree angle, and 400 pounds of force at a 15 degree angle. With a tighter 10 degree angle, that force leaps to 588 pounds on each side. The TYPE of wood the studs are made of makes a big difference in tensile strength as well. Hang at your own risk.

Ah! I guess the load isn't shared, thank you sir, i did not know that.

Then there is also the matter of whether the force is in line or not. Pulling diagonally can impact the ability of the stud to support the load as well without either the bolt pulling out or the stud pulling through the wall.

a 200 pound occupant will exert 200 pounds of force per side with a 30 degree angle, and 400 pounds of force at a 15 degree angle. With a tighter 10 degree angle, that force leaps to 588 pounds on each side.